Alternator fusing
Hi Peter
I assume that you are fitting a fiveway fusebox with standard glass fuses. The ratings of these fuses are misleading, as the Lucas 35 amp fuse, will carry about half of the rating before they warm up and melt, so the 35amp really means that this is the current at which the fuse will blow at.
The two way fuse block as fitted to the majority of 50s and 60s cars, was for a fused 12 volt supply to accessories, and a fused 12 volt supply for ignition switched circuits. Often, both fuses were 35 amp.
The accessories fuse is supplied with a thick Brown cable on one side, and after the fuse the cable colour is Purple.
Likewise, the ignition fuse is fed by a thick White cable, and after the fuse the cable colour is Green.
Before you allocate the cables to the fuses, you will have to determine what each one powers up. When you have tagged them, I suggest that you divide the circuits up as follows;
Two fuses for the Accessories (1) rated at 10 amps (Lucas 20A)
Radio, Clock & Interior Lights
(2) rated at 17.5 amps (Lucas 35A)
Horns & Cigar Lighter ,(Fog lamp if fitted)
Three fuses for Ignition controlled circuits:
(1) rated at 17.5 amps (Lucas 35A)
Wiper Motor & Heater Blower
(2) rated at 10 amps (Lucas 20A)
Fuel Gauge, Direction Indicators,
Reversing Lights,
(Brake Fluid Warning if fitted)
(3) rated at 17.5 amps (Lucas 35A)
Cooling Fans
I hope that this info is of some use to you.
Kind regards
Phillip
|